Page 20 - Arrow Shark X-30 Owner Manual

Engine Performance Tips

Tuned exhaust pipes boost engine power by using the pressure waves generated by exhaust gases to
literally pull more fuel into the cylinder. However, to achieve this, it is critical to have the right length for
the exhaust gases as they travel from the exhaust manifold to the “belly” of the tuned pipe (that’s where
the pipe is at its widest diameter). For our X-30 Engine, this distance is between 320mm to 330mm

which needs to be measured from the exhaust port along the curves of header and then along the
tuned pip to its “belly”. The shorter tuned length will increase more RPM, whilst longer tuned length will
increase more torque from engine.

X-30 Care and Maintenance

A: Keep your engine clean. Spray it with WD40 or a similar product after each outing and wipe it clean to
prevent corrosion to avoid any build-up of dirt that might enter the engine cause wear or overheating.
B: Do not allow your engine to run with too lean a fuel mixture – this causes overheating and rapid wear or
even damage.

C: Do not run your engine with a damaged or unbalanced prop; this causes vibration and can damage
your engine or cause other problems including with your radio equipment.
D: Do not overheat the engine. Frequently check that cooling water is flowing from the outlets in your hull
and never allow your engine to run for more than a minute or so at idle without water flowing through
the cylinder jacket and exhaust cooling fittings.
E: Avoid using old fuel in the engine. Always run all of the fuel out of the engine. After running for the day,
use after-run oil and work it into the engine by pulling the starter 2-3 times. If you run your boat in salt
water, flush the cooling system afterwards with fresh water for several minutes. Drain all water from the
cooling system.
F: Store your engine somewhere that is not subject to extreme temperature change.
G: If you are not planning to run your engine for more than a month, drain the fuel tank and remove any
fuel from inside the carburetor by running the engine at idle until it stops by running out of fuel. Keeping
gasoline inside the carburetor over an extended period of time will damage the diaphragm valve and
clog passages inside the carburetor.